An effective method for the detoxification of cyanide-rich wastewater by Bacillus sp. CN-22.
Appl Microbiol Biotechnol
; 98(8): 3801-7, 2014 Apr.
Article
em En
| MEDLINE
| ID: mdl-24337345
ABSTRACT
The biodetoxification of cyanide-rich wastewater has become increasingly popular because of its cost-effectiveness and environmental friendliness. Therefore, we have developed an effective method, optimised by response surface methodology, for detoxifying cyanide-rich wastewater using Bacillus sp. CN-22, which was newly isolated from a cyanide-contaminated electroplating sludge and could tolerate a CNâ» concentration of 700 mg L⻹. The concentration of CNâ» in the treated wastewater decreased from 200 to 6.62 mg L⻹ after cultivation with 2.38 % inocula for 72 h on the medium, consisting of 0.05 % KH2PO4, 0.15 % K2HPO4, 1.0 mM MgCl2, 1.0 mM FeCl3, 0.1 % NH4Cl, and 0.1 % glycerol. The CNâ» degradability of 96.69 % is similar to the predicted value of 96.82 %. The optimal cultivation conditions were controlled as follows initial pH, 10.3; temperature, 31 °C; and rotary speed, 193 rpm. The maintenance of higher pH in the overall treatment procedures may avoid the production of volatile HCN and the risk associated with cyanide detoxification. Additionally, the bacterial strain Bacillus sp. CN-22, with its potent cyanide-degrading activity at the initial CNâ» concentration of 200 mg L⻹, may be employed to effectively treat cyanide-rich wastewater, especially electroplating effluent.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Bacillus
/
Cianetos
/
Águas Residuárias
Tipo de estudo:
Prognostic_studies
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article